[linux-yocto] [kernel v5.2/standard/xlnx-soc][PATCH 2/2] arch: arm64: dts: add overlay dts file

[Quanyang Wang]

On 10/14/19 2:05 PM, Michal Simek wrote:
> On 13. 10. 19 15:33, quanyang.wang at windriver.com wrote:
>> From: MengLi <meng.li at windriver.com>
>>
>> Add overlay dts file for updating FPGA bitstream file on
>> zynqmp platform.
>>
>> Signed-off-by: Meng Li <Meng.Li at windriver.com>
>> Signed-off-by: Quanyang Wang <quanyang.wang at windriver.com>
>> ---
>>   arch/arm64/boot/dts/xilinx/Makefile            |  1 +
>>   .../dts/xilinx/zynqmp-zcu102-fpga-update.dts   | 18 ++++++++++++++++++
>>   2 files changed, 19 insertions(+)
>>   create mode 100644 arch/arm64/boot/dts/xilinx/zynqmp-zcu102-fpga-update.dts
>>
>> diff --git a/arch/arm64/boot/dts/xilinx/Makefile b/arch/arm64/boot/dts/xilinx/Makefile
>> index bec4746fe721..d56c449988d0 100644
>> --- a/arch/arm64/boot/dts/xilinx/Makefile
>> +++ b/arch/arm64/boot/dts/xilinx/Makefile
>> @@ -13,6 +13,7 @@ dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu100-revC.dtb
>>   dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu102-revA.dtb
>>   dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu102-revB.dtb
>>   dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu102-rev1.0.dtb
>> +dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu102-fpga-update.dtb
>>   dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu104-revA.dtb
>>   dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu104-revC.dtb
>>   dtb-$(CONFIG_ARCH_ZYNQMP) += zynqmp-zcu106-revA.dtb
>> diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-zcu102-fpga-update.dts b/arch/arm64/boot/dts/xilinx/zynqmp-zcu102-fpga-update.dts
>> new file mode 100644
>> index 000000000000..f1e1506b6210
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/xilinx/zynqmp-zcu102-fpga-update.dts
>> @@ -0,0 +1,18 @@
>> +// overlay dts file.
>> +/dts-v1/;
>> +/plugin/;
>> +
>> +/ {
>> +	fragment at 0 {
>> +		target-path = "/fpga-full";
>> +		#address-cells = <1>;
>> +		#size-cells = <1>;
>> +
>> +		__overlay__ {
>> +			#address-cells = <2>;
>> +			#size-cells = <2>;
>> +
>> +			firmware-name = "system.bit.bin";
>> +		};
>> +	};
>> +};
>>
> I understand what you want to do but not sure why you think that this is
> the best way how to do it.

Hi Michal,

This patch is based on the url:

https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841847/Solution+ZynqMP+PL+Programming#x-Programming+the+PL+through+Linux

"FPGA programming using Device Tree Overlay (DTO)".

We will describe how to programming FPGA by using 2 methods in README 
for our customer:

one is FPGA programming using sysfs attributes 
<https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841847/Solution+ZynqMP+PL+Programming#SolutionZynqMPPLProgramming-FPGAprogrammingusingsysfsattributes>

And the other is FPGA programming using Device Tree Overlay (DTO) 
<https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841847/Solution+ZynqMP+PL+Programming#SolutionZynqMPPLProgramming-FPGAprogrammingusingDeviceTreeOverlay(DTO)>

This patch is used for the second method.

Is there any better way to do it?

Thanks,

Quanyang


>
> Thanks,
> Michal
>
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